rounding decimals

In order to round a decimal you must underline the digit you want to round then look at the digit to the right of the digit you want to round. If it is four or less the digit you want rounded stays the same, if it is five or above the digit that you want rounded should increase by one.

check out this example
http://www.mathleague.com/help/decwholeexp/decwholeexp.htm
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check out these examples of decimals

these decimals aren't rounded, and Billy needs to round them to the nearest ten. If you can't reread how to round a decimal

If you can solve this problem your a decimal genius

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Tommy was rounding 66.211 to the nearest tenth, and he got 66.220, what did he do wrong?